Evas Saint Quest

where do you start it?
i thought u were getting a stone to get the class change immediately
GOD is soo confusing im gooogling it and i cant find ANYTHING
help plz :/ <3

Try this link: http://www.lineage2.com/en/game/patch-notes/goddess-of-destruction/quests/new-quests.php#Class

The stone you get is for the 4th class choice. Now the 3rd class change is based on race not class, so all elf classes do the same quest. At least that's how I understood it :P